package practice.w909;

public class StaticFinalDemo {
  public static void main(String[] args) {
      System.out.println(Loo.PI); //常常通过类名点来访问
      //Loo.PI = 3.1415926; //编译错误，常量不能被改变

      //1)加载Loo.class到方法区中
      //2)静态变量num一并存储到方法区中
      //3)到方法区中获取num的值并输出
      System.out.println(Loo.num);
      //编译器在编译时会将常量直接替换为具体的数，效率高
      //相当于System.out.println(5);
      System.out.println(Loo.COUNT);
  }
}

class Loo{
    public static int num = 5; //静态变量
    public static final int COUNT = 5; //常量(静态常量)

    public static final double PI = 3.14159;
    //public static final int NUM; //编译错误，常量必须声明同时初始化
}


// System.out.println(Loo.PI);
////Loo.PI = 3.1415926;
//           System.out.println(Loo.num);
//           System.out.println(Loo.COUNT);
//       }
//               }
//class Loo{
//    public static int num = 5;
//    public static final int COUNT = 5;
//    public static final double PI = 3.14159;
//    //public static final int NUM;
